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MathGroup Archive 2007

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Re: Exclusions in V6

  • To: mathgroup at smc.vnet.net
  • Subject: [mg78373] Re: [mg78275] Exclusions in V6
  • From: Murray Eisenberg <murray at math.umass.edu>
  • Date: Fri, 29 Jun 2007 05:49:46 -0400 (EDT)
  • Organization: Mathematics & Statistics, Univ. of Mass./Amherst
  • References: <200706270931.FAA01400@smc.vnet.net>
  • Reply-to: murray at math.umass.edu

 From a June 20 message from ulises at WRI:  "the reason for this 
[failure to find the Tan exclusions automatically] is a technical
one, but we expect to extend the Automatic handling in future
releases."

David Park wrote:
> The new Exclusions option in V6 is quite nice.
> 
> The following works:
> 
> Plot[Tan[x], {x, -3 \[Pi], 3 \[Pi]}, Exclusions -> Cos[x] == 0]
> 
> However, in view of the Exclusions Help page:
> 
> "Exclusions -> Automatic excludes all subregions where discontinuities are 
> found in functions being plotted. The discontinuities can involve either 
> finite or infinite jumps in function values."
> 
> I don't understand why the following fails.
> 
> Plot[Tan[x], {x, -3 \[Pi], 3 \[Pi]}, Exclusions -> Automatic]
> 
> 

-- 
Murray Eisenberg                     murray at math.umass.edu
Mathematics & Statistics Dept.
Lederle Graduate Research Tower      phone 413 549-1020 (H)
University of Massachusetts                413 545-2859 (W)
710 North Pleasant Street            fax   413 545-1801
Amherst, MA 01003-9305


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